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Updated: Jan 7, 2026
Three-Dimensional 3D Tumor Spheroid Invasion Assay
Published on: May 1, 2015
3D Breast Cancer Spheroids Reveal Architecture-Dependent HER2 Expression and Signaling
Pietro Arnaldi1,2, Valentina Delli Zotti3, Grazia Bellese1
1Department of Experimental Medicine (DIMES), MorphoLAB, University of Genoa, 16132 Genoa, Italy.
Background:
Three-dimensional (3D) culture systems offer a physiologically relevant alternative to monolayers for studying tumor organization, signaling, and drug response. HER2-positive breast cancers (BCa) account for 15-30% of BCa cases and benefit from HER2-targeted therapies, yet predictive in vitro models remain limited.
Objective:
To generate and compare 3D spheroids from two HER2+ BCa cell lines, SKBR3 and BT474, and investigate how 3D architecture influences HER2 distribution, intracellular signaling, and cellular organization.
Methods:
Spheroids were reproducibly generated from SKBR3 and BT474 cells and analyzed after 4 days of culture. Cell viability was evaluated using live/dead staining, HER2 distribution was assessed by confocal microscopy and quantified on cryosections, and protein expression/phosphorylation was measured by Western blotting. Epithelial and EMT markers were visualized by immunofluorescence, and ultrastructural features were examined by transmission electron microscopy (TEM).
Results:
Both cell lines formed viable spheroids with distinct architectures: SKBR3 spheroids were loose and heterogeneous, whereas BT474 spheroids were compact and highly spherical. Confocal and cryosection imaging showed consistent membrane HER2 localization with a progressive signal decrease toward the core of the spheroids, more pronounced in BT474. Western blotting revealed divergent HER2 expression and AKT phosphorylation: SKBR3 spheroids displayed increased HER2 but reduced pAKT, while BT474 spheroids showed reduced HER2 and pAKT levels. EpCAM and E-cadherin staining revealed cell line-specific epithelial organization, and TEM demonstrated differences in intercellular spacing and mitochondrial morphology, reflecting spheroid compactness.
Conclusions:
3D architecture profoundly influences HER2 distribution, signaling, and structural organization in HER2+ BCa spheroids. This model provides a robust platform for investigating architecture-dependent molecular processes, with potential applications in drug response, receptor trafficking, and targeted therapy evaluation.
Insights
Three-dimensional (3D) models reveal how tumor architecture impacts HER2 distribution and signaling in HER2-positive breast cancer (BCa). These findings advance in vitro models for studying BCa and evaluating targeted therapies.
Area of Science:
- Oncology
- Biotechnology
- Cell Biology
Background:
- Three-dimensional (3D) cell culture models offer a more physiologically relevant alternative to traditional 2D monolayers for studying cancer biology.
- HER2-positive breast cancer (BCa) is a significant subtype that benefits from targeted therapies, but predictive in vitro models are limited.
Purpose of the Study:
- To generate and compare 3D spheroids from two HER2-positive BCa cell lines (SKBR3 and BT474).
- To investigate the influence of 3D architecture on HER2 distribution, intracellular signaling, and cellular organization within these spheroids.
Main Methods:
- Reproducible generation and 4-day culture of SKBR3 and BT474 spheroids.
- Assessment of cell viability, HER2 distribution (confocal microscopy, cryosections), protein expression/phosphorylation (Western blotting), epithelial markers (immunofluorescence), and ultrastructure (transmission electron microscopy - TEM).
Main Results:
- SKBR3 spheroids were loose and heterogeneous; BT474 spheroids were compact and spherical.
- HER2 localized to the membrane with signal decrease towards the spheroid core, more pronounced in BT474 spheroids.
- Divergent HER2 expression and AKT phosphorylation observed: SKBR3 showed increased HER2/reduced pAKT; BT474 showed reduced HER2/pAKT. Differences in epithelial markers and ultrastructure correlated with spheroid compactness.
Conclusions:
- 3D architecture significantly impacts HER2 distribution, signaling, and organization in HER2-positive BCa spheroids.
- This 3D model serves as a robust platform for studying architecture-dependent processes.
- Potential applications include drug response evaluation, receptor trafficking studies, and targeted therapy assessment.
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